Any ideas on what I should do

[Kabees]

1 week ago I developed shortness of breath while walking normally after a few minutes. I felt fine while resting. I also experienced sharp pains in my chest and right side of neck. The pains would last a few seconds and go away. They seem to be gone now. But this past Sunday I was sitting and suddendly felt lightheaded, fatigued and felt as if I was going to faint. The feeling lasted the rest of the day. I felt the same on Monday as well as Tuesday, and I decided to go to the hospital Tuesday.
They did a ton of bloodwork, EKG, and gave me a physical and all the tests were normal. I was given 2 IV bags of fluids and felt no better after and I was sent home. Before I left I was told to talk about it with my PCP to see what if anything she could do...
What are the possibile reasons for my sudden onset of lightheadedness, fatigue and faintness that have lasted all this time and the ER staff were unable to figure out?  What should I do now?

[Kabees]

Thanks so much for your response, it is very helpful!
If u don't mind I have a couple of questions. I had an ECHO of my heart done in 2007 which was normal, is it possible I could develop a problem like MVP since then?
I'm also no longer feeling any kind of chest/neck pains, just lightheaded. If there was some kind of embolism could the pain from that appear and then disappear?

Thanks!

[Dr. Kokil Mathur]

Hi
Welcome to the MedHelp forum!
Sharp pains in chest and right side of neck with dizziness can be due to severe gastric reflux or pulmonary embolism or pulmonary hypertension. Both pulmonary embolism or pulmonary hypertension can be serious and consult your PCP to eliminate these with the help of a cardiologist. For GERD you can take omeprazole empty stomach and avoid alcohol, smoking, spicy food.
There are many causes of dizziness, lightheadedness, passing out, blackouts etc. It is difficult to comment without examination. I am just enumerating the possible causes. You can discuss this with your doctor and get yourself examined. Dizziness could be due to postural hypotension (blood pressure falling with change of position), internal ear problems and cervical spondylitis or compression of cervical spinal nerves. All these cause dizziness when you get up from lying down position or when you change position that results in a change in the level of your head. Cervical spondylitis and ear problems also cause dizziness on changing the position of the neck.
Other causes are anemia, claustrophobia, GERD, hypoglycemia or low sugar and some endocrine problems. Endocrine problems, such as an underactive thyroid (called hypothyroidism), overactive thyroid (called hyperthyroidism), adrenal insufficiency (called Addison's disease), low blood sugar levels, and in some cases, diabetes, may lead to hypotension and hence lightheadedness and an off balance feeling.
Certain types of epilepsies and seizures too can cause similar symptoms. If you have an accompanying headache then you must also look at benign intracranial hypertension. Heart problems too should be ruled out in your case. If all other tests are normal, maybe an ECHO should be done to rule out mitral valve prolapse.
It is difficult to comment beyond this without examining. A comprehensive investigation is required keeping all the points in mind.
Hope this helps. Take care!